The Hr1 class (original classification P1) was the largest passenger express steam locomotive built in Finland.

The class's nickname was "Ukko-Pekka", meaning approximately "(respected) Grandpa Pekka", after the President of Finland Pehr Evind Svinhufvud.

Larger chimneys needed for extinguishing wood sparks were temporarily fitted.

Their use ended officially in 1971, but two Hr1s equipped with roller bearings were brought back to use for a short time in the spring of 1974.

Hr1's sister locomotive was the Tr1 class, otherwise similar, but with 2-8-2 wheel arrangement and smaller diameter drivers for freight train use.